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Duracell CopperTop All-Purpose 9-Volt Alkaline batteries are not only dependable they?re also long-lasting. You can take comfort in Duralock Power Preserve Technology that gives you a 5-year guarantee in storage. Plus they?re great for important devices in your home like smoke and carbon monoxide detectors. And since Duracell is the #1 trusted brand of first responders and firefighters you know they?re a battery you can trust.